mykolas.
First I searched the avast! forums for "NetsrchHijack [Trj];" the only post it found was yours. Second, I searched the rest of Alwil's web site for "NetsrchHijack" using its search feature without results. Manually looked around under the Viruses Menu. Again no luck.
Then I searched about a half dozen virus databases without any hits, searching first for "NetsrchHijack" (no joy) then for various combinations of "network," "search," "hijack," and "trojan." As expected, I got hundreds of hits and looked at a lot of them, but nothing I saw looked applicable.
Finally, I did a similar series of searches at Google, first in their discussion groups (a bust) followed by a websearch, getting 2 hits. The first search result looked promising, it contained the text "Win32:NetsrchHijack [Trj]" along with "How to remove ... ," and it was at, guess where, Alwil's web site. Go figure. After clicking the link, I was taken to the VPS history page, which only displays the lists of malware included in each update -- nothing at all about dealing with the trojan. The second was at a security website and linked to a thread announcing variaous signature updates, including avast!'s.
At this point, mykolas, you're going to have to gives us some more info so we can help you. In what file did the scanner detect the trojan, and in what directory was it? What information is displayed on the file's property page -- Comments, Company, Internal Name, Original file name, and Product Name?
Have you tried to verify that it's not a false positive with an online scanner. If a few online scans turn up empty, it may be nothing to worry about. But if the online scans detect a trojan in the same file, you'll get instructions for removal or at least an alias you can use to search for more information.
Search the forum for online scanner, you'll get plenty of hits, or go to the sticky topic Links (for almost everything ...) in the General Topics forum. Technical has done an excellent job of listing software that is compatible with avast!, including online scanners, organized by software category.
Regards,
Hornus
